Bug in Dynamic Enum options??

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Bug in Dynamic Enum options??

Craig McDonnell

Hi all,


I’m trying to define a HasTraits class with a dynamic Enum following the example here:



The following code raises an error when running the line: spike.root_model = 'model4'


import unittest

from enthought.traits.api import Enum, HasTraits, List, Property



class Spike(HasTraits):


    models = Property(List)

    root_model = Enum(values='models')


    def _get_models(self):

        return ['model1', 'model2', 'model3']



class TestRunner(unittest.TestCase):


    def test_enum(self):

        spike = Spike(root_model='model1')

        spike.root_model = 'model2'

        # The following line should fail, but does so for the wrong reason:

        spike.root_model = 'model4'



if __name__ == "__main__":



The exception raised is:


Traceback (most recent call last):

  File "C:\Workspaces\PYTHON\######\test_spike.py", line 24, in test_enum

    spike.root_model = 'model4'

  File "C:\Python25\lib\site-packages\traits-3.1.0n1-py2.5-win32.egg\enthought\traits\trait_types.py", line 1974, in _set

    self.error( object, name, value )

  File "c:\python25\lib\site-packages\traits-3.1.0n1-py2.5-win32.egg\enthought\traits\trait_handlers.py", line 174, in error

    raise TraitError( object, name, self.full_info( object, name, value ),

  File "C:\Python25\lib\site-packages\traits-3.1.0n1-py2.5-win32.egg\enthought\traits\trait_types.py", line 1939, in full_info

    return ' or '.join( [ repr( x ) for x in values ] )

UnboundLocalError: local variable 'values' referenced before assignment


This seems to be because full_info references values without setting it when name is not an empty string:


    def full_info ( self, object, name, value ):

        """ Returns a description of the trait.


        if self.name == '':

            values = self.values


            value = eval( self.values )


        return ' or '.join( [ repr( x ) for x in values ] )


Is this a bug or is there something I am doing wrong here? Should the line value = eval( self.values ) actually read values = eval( self.values )?





Craig McDonnell


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